JPS5818339Y2 - limiter circuit - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a limiter circuit with variable sautéing level.

A limiter circuit limits the amplitude of a signal to improve the S/N ratio and adjust the level. Conventional limiter circuits use a dedicated detection circuit for level detection, and the limiting level is not fixed. Therefore, it was impossible to freely change the level.

Furthermore, it was difficult to set this level, and variations occurred even among the same model.

The present invention has been developed in view of this point, and it is possible to selectively use multiple input signals of an output status multi-point display that displays output levels or peak values as limiting levels, thereby increasing the limiting level. The present invention aims to provide a limiter circuit that is accurate and variable.

Hereinafter, one embodiment of the present invention will be described with reference to the figures.
2 is an input level adjuster, 2 is an amplifier, and 3 is a □ vine amplifier. For example, a transistor limiter is used for the □ vine amplifier 3.

4 is an amplifier, 5 is a meter amplifier, and this meter amplifier 5
is provided with four output terminals 5a to 5d so as to sequentially output an output according to the peak level of the signal, and a light emitting diode 6a to 6d is connected to each output.

7 beam □ A switch for changing the limiter level to the ivy amplifier 3, and the limiter level is used by appropriately selecting each output of the meter amplifier 5.

In the above, when the switch 7 is switched to the OFF contact, none of the light emitting diodes 6a to 6d lights up when the peak level of the signal does not reach the comparison level corresponding to the output terminal 5a of the meter amplifier 5, but the output i5a
The light emitting diode 6a lights up when the comparison level is higher than the comparison level corresponding to the output terminal 5b and at the end of the comparison level corresponding to the output terminal 5b.

at or above the comparison level corresponding to the output end 5b, and at the output end 5
When the value is less than the comparison level corresponding to c, the light emitting diodes 6a and 6b are turned on.

Thereafter, when the peak level of the signal becomes higher, the light emitting diodes 6a to 6d light up in a superimposed manner.

Next, when the switch T is switched to the contact 7a, the output end 5a of the meter amplifier 5 is connected to the limiter amplifier 3, thereby setting the limit level.
As soon as the peak level of the signal reaches the comparison level corresponding to the output terminal 5a, the ivy operation is started and the amplitude of the signal is limited in the limiter amplifier 3.

In this case, only the light emitting diode 6a blinks in response to the input signal, and the other light emitting diodes 6b to 6d do not light up.

This state is shown by characteristic curve 1a in FIG.

Similarly, switch 1 as a contact? When switching to levels b to 7d, different limiting levels are set, resulting in characteristic curves 7b to 7d in FIG.

FIG. 3 is a block diagram showing another embodiment. In this case, a level indicator 8 that displays the level in a bar graph is connected to a plurality of outputs of the meter amplifier 5 on which comparison levels are set, and The output is selected by switch 7 and set to a limiting level.

In this case as well, the operation is the same as in the case of FIG. 1 above.

From the above, according to the present invention, multiple input signals to an output status multi-point display such as a peak value display or a level display are selectively used as a limiting level signal, so that the limiting level signal can be changed. becomes possible and accurate.

Furthermore, since no special level detector is required, it is advantageous in terms of cost.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a limiter circuit according to an embodiment of the present invention, FIG. 2 is a limiting operation characteristic diagram, and FIG. 3 is a block diagram of a limiter circuit according to another embodiment of the present invention. 3...Limiter amplifier, 5...Meter amplifier, γ...Switch.

Claims (1)

[Scope of utility model registration request] amplitude limiting means for limiting the amplitude of an input signal and outputting it; output level display means for displaying an output state by a plurality of signals corresponding to the output level of the amplitude limiting means; and selecting one of the plurality of signals. and amplitude limit level control means for setting the amplitude limit level of the amplitude limit means to an output level corresponding to the selected signal using the selected signal.